[issue17883] Fix buildbot testing of Tkinter

[Jeremy Kloth]

Jeremy Kloth added the comment:

Although the solution for test_ttk_guionly of disabling the gui resource is a good quick fix, I'm curious as to why there isn't the same issue (test hangs) when run using 3.3 on the same machine.

Note that by running as a service without desktop interaction several assumptions wrt permissions have been uncovered, so I'm quite hesitant to flip that switch.

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<http://bugs.python.org/issue17883>
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